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I had considered that the Winter Lotus Family could have some kind of dragon blood on them giving them the power to automatically tame the lunar dragon, but showing how there were many that Tsukuyomi didn't choose, it might just end up being a thing of preference.
But I asked to him directly through telepathy.
"Hm? I don't really know, I wasn't conscious before hatching, but I did felt the presences of others when they approached me, but Mikohime was different, she was the first one where I felt such a strong connection with… It made me hatch from my egg just so I could meet her." Said Tsukuyomi.
"Hm… I see. Perhaps her family really has Lunar Dragon Bloodline but it hasn't truly awakened as much as the bloodline I can give to others… Perhaps if she were to grow stronger it might awaken, as of now I cannot really find it in her information… Of course, there are these five weird Lotus Abilities…" I said to him through telepathy.
Check "The Protagnist's Sister Is Actually the Strongest"!